Hackaday Project: msx-compatible-boards-for-rc2014
The YM2149 sound and controller board, designed for RC2014 systems, is part of planned series of boards, to provide full MSX2+ compliance.
Highlights:
- YM2149 PSG - 3 channel audio, +1 noise channel
- 2 Controller Inputs (joystick, game-pad, and other input types) - MSX compatible
- optional additional audio input lines, for mixing into the audio out.
A video of it in operation with the V9958 Video board at: https://youtu.be/dUCEZpBlxgY
| Count | Name | Designator |
|---|---|---|
| 4 | 10uF | C10,C13,C12,C11 |
| 6 | 0.1uF | C3,C8,C1,C5,C4,C2 |
| 2 | 33pF | C7,C6 |
| 8 | 1N4148 | D8,D5,D7,D6,D4,D3,D2,D1 |
| 1 | 400mA Fuse | F1 |
| 1 | AUD-OUT | H1 |
| 1 | KYB-TYPE | J1 |
| 1 | BUS-MAP | J2 |
| 1 | JOYSTICK-A | JY1 |
| 1 | JOYSTICK-B | JY2 |
| 1 | ACTIVE | LED1 |
| 1 | 3.5 Audio Socket | P1 |
| 1 | 10k Ω Bussed x 12 | R1 |
| 3 | 4k7 Ω | R10,R11,R4 |
| 2 | 10k Ω | R2,R12 |
| 1 | 470 Ω | R3 |
| 1 | 1M Ω | R5 |
| 1 | 330 Ω | R6 |
| 1 | 2k2 Ω | R7 |
| 1 | 20k Ω | R9 |
| 1 | 74HCT138 | U1 |
| 1 | YM2149 | U2 |
| 1 | 74HC00 | U3 |
| 1 | 74LS07 | U4 |
| 2 | 74HCT157 | U6,U5 |
| 1 | 3.579545MHz | X1 |
| 1 | Right Angle 20x2 Header | B1 |
| 1 | Right Angle header 1x20 | B1 |
| 2 | 14 POS IC SOCKET | |
| 3 | 16 POS IC SOCKET | |
| 1 | 40 POS IC SOCKET |
The tune.com cp/m distributed with RomWBW works just find with the board - as it has the standard MSX ports.
Standard MSX port mapping.
| Port | range | Description |
|---|---|---|
| #A0 | (write) | Register write port |
| #A1 | (write) | Value write port |
| #A2 | (read) | Value read port |
The following table describes the registers of the PSG:
| Register(s) | Description |
|---|---|
| 0-5 | Tone generator control |
| 6 | Noise generator control |
| 7 | Mixer control-I/O enable. Important note: bit 6 must be 0, and bit 7 must be 1. |
| 8-10 | Amplitude control |
| 11-13 | Envelope generator control |
| 14-15 | I/O ports A & B |
- Schematic: schematic.pdf
- YM2149 Datasheet